Japan Pollen Forecast 2026: Official Sources and Regional Government Updates

Last updated: 2026-03-08

If you are planning a trip to Japan in spring 2026, it is better to check official sources rather than rely on a single catchy “forecast” headline. In Japan, the official picture is split across several public sources: the Ministry of the Environment’s nationwide pollen information site, prefectural or metropolitan government updates, and weather data support from the Japan Meteorological Agency. The JMA itself explains that private operators carry out pollen forecasts, while the agency provides the weather data that helps make those forecasts possible. Learn more about Japan’s hay fever and it’s mechanism.

Quick answer

For 2026, the official public data suggest that parts of western and central Japan may have a tougher cedar pollen season than average, while the picture is more mixed in the Kanto region. In the Ministry of the Environment’s 2025–2026 male flower bud survey, the pollen-producing cedar bud counts were far above the 10-year average in Kyoto Prefecture (272%), Osaka Prefecture (315%), and Nara Prefecture (312%). By contrast, Tokyo was 87% of its 10-year average and Kanagawa was 119%. These bud-count figures are not the same thing as the exact pollen exposure a traveler will feel on a given day, but they are one of the key official early indicators used to understand the coming season.

What the official national sources show

The Ministry of the Environment runs Japan’s main national pollen information site. It publishes current cedar and cypress pollen measurements, the annual male flower bud survey results, and links to regional government pages. For the 2026 season, the Ministry said the 2025 bud survey was conducted in all 47 prefectures, and several prefectures were more than 200% of the 10-year average, including Kyoto, Osaka, Nara, Hokkaido, Yamagata, Shizuoka, Aichi, Tottori, and Tokushima.

This matters for travelers because high bud counts usually mean a higher-risk season, especially if you already know that cedar pollen triggers your symptoms. Still, official data should be read carefully: bud counts are a seasonal signal, while day-to-day symptom severity depends on temperature, wind, rain, local geography, and the exact timing of your trip.

Tokyo’s official 2026 update

Tokyo has one of the clearest official public updates for 2026. On February 3, 2026, the Tokyo Metropolitan Government said the expected start of cedar pollen dispersal in Tokyo was around February 13 to 14, which was roughly in line with the past 10-year average of around February 14. Tokyo also noted that small amounts of pollen can scatter even before the official start date, so early preparation is still needed.

Tokyo’s current pollen pages also say that the season has already entered a full-scale dispersal period, that cedar pollen tends to peak around mid-March, and that cypress pollen tends to peak from early to mid-April. So for travelers visiting Tokyo in March or April 2026, this is not a hypothetical issue anymore; it is already part of the real travel environment.

Kyoto and the wider Kansai picture

Kyoto is more complicated because there is no single polished 2026 Kyoto-traveler page equivalent to Tokyo’s forecast page. However, the official public signals are still strong. In the Ministry of the Environment’s bud survey, Kyoto Prefecture was 272% of the 10-year average, Osaka 315%, and Nara 312%, which points to a potentially difficult cedar season in the Kansai area.

Kyoto Prefecture’s own allergy page does not publish a new 2026 seasonal forecast headline, but it does advise people to check pollen dispersal conditions, use protective items such as masks and glasses, and consider starting medication before the pollen season begins or when symptoms are still very mild.

There is also one practical Kyoto-specific detail worth knowing: Kyoto City ended its own pollen information service on March 31, 2023, and now directs users to the Ministry of the Environment’s pollen information site instead. So if you want an official Kyoto-area source today, the cleanest path is to use the Environment Ministry’s national site and Kyoto Prefecture’s health guidance together.

When pollen is usually worst

Official government guidance says cedar pollen in Japan typically disperses around February to April. Government materials also warn that pollen tends to be heavier around midday and in the evening, and that it can be especially heavy on warm sunny days, dry windy days, and the day after rain.

For 2026, that means many spring travelers should treat March and April as the main caution period, especially in places where the official bud survey was far above average. If your trip is flexible and avoiding pollen is a priority, this is one of the strongest arguments for choosing another season altogether. That last sentence is an inference based on the official seasonality, timing, and regional bud-count data above.

How to use the official sources before your trip

If you want the safest practical approach, use the official sources in layers. First, check the Ministry of the Environment’s national pollen site for current measurements and regional links. Second, check any prefectural or metropolitan source for your destination, especially if you are going to Tokyo or Kanagawa, where official forecast-style updates are clearer. Third, if you already get seasonal symptoms every year, do not wait until you are miserable: government guidance says people who usually develop symptoms should prepare and start using medication by about one week before the full-scale pollen season starts.

Official links worth checking

The most useful official starting point is the Ministry of the Environment pollen information site, because it brings together current cedar/cypress data, the annual bud survey, and links to local government pages. For Tokyo, the Tokyo Metropolitan Government allergy information site is especially useful because it gives public start-date forecasts and current trend updates. For Kanagawa, the prefectural government has already said that 2026 spring cedar and cypress pollen are expected to be slightly above average.

Bottom line for 2026

If you are going to Kyoto, Osaka, or Nara in spring 2026 and you are sensitive to cedar pollen, you should assume a higher-risk season than usual rather than a mild one. If you are going to Tokyo, the official picture looks less severe than Kyoto’s bud signal, but the season has already started and Tokyo’s own official pages say cedar peaks are usually in mid-March and cypress peaks in early to mid-April. For a traveler, that is the practical takeaway: the 2026 season is real, already underway, and worth planning around.

FAQ

Is there one official nationwide pollen forecast for all of Japan?

Not exactly. In Japan, there is no single government-run page that works as one simple nationwide “official forecast” in the way some travelers might expect. The Japan Meteorological Agency says private operators carry out pollen forecasts, while JMA provides the weather data that helps support those forecasts. In practice, the safest official approach is to combine the Ministry of the Environment’s pollen site with local government updates for your destination.

Which official source should I check first?

Start with the Ministry of the Environment’s pollen information site. It provides current cedar and cypress pollen data, the latest male flower bud survey results, and links to prefectural and city-level pages. That makes it the best single official starting point, even though travelers may still want a local page as a second step.

What is the official Tokyo update for 2026?

Tokyo’s official 2026 update said the expected start of cedar pollen dispersal in the Tokyo area was around February 13 to 14, 2026. Tokyo also noted that small amounts of pollen can scatter even before the official start date, so waiting until symptoms become severe is not ideal.

Is there an official Kyoto City pollen forecast page for 2026?

Not in the way many travelers might hope. Kyoto City’s pollen information page says the city ended its pollen information service on March 31, 2023 and now directs users to the Ministry of the Environment’s pollen site instead. So for Kyoto, it is better to treat the Environment Ministry’s site as the main official reference, with Kyoto Prefecture’s allergy page as a supporting source.

Is Kansai likely to be difficult for pollen-sensitive travelers in spring 2026?

Possibly yes. In the Ministry of the Environment’s latest male flower bud survey, Kyoto Prefecture was 272% of its 10-year average, Osaka was 315%, and Nara was 312%. That does not tell you exactly how bad a specific day will feel, but it is a strong official signal that spring 2026 may be a harder season than usual in parts of Kansai if cedar pollen is a trigger for you.

If I am traveling in March or April 2026, what is the safest way to use official information?

Check the national Environment Ministry site first, then check the local government page for your destination if one is available. For Tokyo, March to April is already part of the real pollen season, not just a theoretical risk. For Kyoto, official local guidance is more fragmented, so travelers should rely more heavily on the Environment Ministry site and general allergy precautions.